I am ready to start filling and bleeding my loop, and I have ran into a problem I can't figure out. I originally build the loop with a Swiftech MCP655 pwm pump I had lying around. It had already run OK in another system for a couple of months, but I took it out and replaced it with an Aquacomputer and put it away. When I connected it to my external PSU in the new loop, it wouldn't run at all, either with the pwm connector plugged in or disconnected. So, I took out that pump, and replaced it with a NIB XSPC D5 pwm, and the same thing happened again!
I'm trying to power the pumps from an external PSU. It's a cheapo I keep around specifically for this, so I immediately suspected the psu was thhe problem, rather than two pumps in a row. But the PSU seems to be OK according to my tester, and it will power molex LEDs from the same connector I was trying to use for my pumps.
What both unresponsive pumps have in common is I sleeved them both. Maybe I got over-enthusiastic when tightening the sleeve and yanked a wire from the PCB inside the pump? Possible but doubtful. Easy enough to check, though, if I knew how to open them up. I've seen pictures of open D5s here, so maybe someone can tell me how to do it?
The other thing they have in common is being installed in a brand new EK Revo top. Is it possible to do something dumb with the top installation that would prevent the pumps from running?
Any tips or suggestions would be much appreciated. I'm stuck!

EDIT: I figured out how to pry the pump open, it's not difficult at all. All wires are still solidly soldered inside the Swiftech, but it won't run! I put together a makeshift loop with just a bucket full of water, and hoses to both the inlet and outlet of the stock housing, and the pump won't run in that setup either.

EDIT: Solved. I had reversed the pins in the molex connections. I was connecting them to the 5V wire instead of the 12V wire.Edited by jvillaveces - 2/4/16 at 9:09pm